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Experiments in Fluids

, 59:13 | Cite as

Aeroacoustic analysis of the human phonation process based on a hybrid acoustic PIV approach

  • Alexander LodermeyerEmail author
  • Matthias Tautz
  • Stefan Becker
  • Michael Döllinger
  • Veronika Birk
  • Stefan Kniesburges
Research Article

Abstract

The detailed analysis of sound generation in human phonation is severely limited as the accessibility to the laryngeal flow region is highly restricted. Consequently, the physical basis of the underlying fluid–structure–acoustic interaction that describes the primary mechanism of sound production is not yet fully understood. Therefore, we propose the implementation of a hybrid acoustic PIV procedure to evaluate aeroacoustic sound generation during voice production within a synthetic larynx model. Focusing on the flow field downstream of synthetic, aerodynamically driven vocal folds, we calculated acoustic source terms based on the velocity fields obtained by time-resolved high-speed PIV applied to the mid-coronal plane. The radiation of these sources into the acoustic far field was numerically simulated and the resulting acoustic pressure was finally compared with experimental microphone measurements. We identified the tonal sound to be generated downstream in a small region close to the vocal folds. The simulation of the sound propagation underestimated the tonal components, whereas the broadband sound was well reproduced. Our results demonstrate the feasibility to locate aeroacoustic sound sources inside a synthetic larynx using a hybrid acoustic PIV approach. Although the technique employs a 2D-limited flow field, it accurately reproduces the basic characteristics of the aeroacoustic field in our larynx model. In future studies, not only the aeroacoustic mechanisms of normal phonation will be assessable, but also the sound generation of voice disorders can be investigated more profoundly.

Notes

Acknowledgements

This work was supported by the European Unions Seventh Framework Programme for research, technological development and demonstration under Grant agreement no. 308874. Additionally, the work was supported by the Else Kröner-Fresenius Stiftung under Grant agreement no. 2016 A78. The authors also gratefully acknowledge the funding of the Erlangen Graduate School in Advanced Optical Technologies (SAOT) by the German Research Foundation (DFG) within the framework of the German Excellence Initiative.

Supplementary material

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Institute of Process Machinery and Systems EngineeringFriedrich-Alexander University Erlangen-NurembergErlangenGermany
  2. 2.Erlangen Graduate School in Advanced Optical Technologies (SAOT)Friedrich-Alexander University Erlangen-NurembergErlangenGermany
  3. 3.Division for Phoniatrics and Pediatric Audiology, Department of Otorhinolaryngology, Head and Neck Surgery, Medical SchoolFriedrich-Alexander University Erlangen-NurembergErlangenGermany

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